DE2546554C2 - Spiral staircase - Google Patents

Description

45

The invention relates to a spiral staircase with tread plates that engage in the spindle and have spacers for the step plates in the area of the spindle, as well as one arranged in the axis of the spindle, the step plates and the spacers penetrating, vertical tension cord, wherein the tread plates each one from the outer circumferential edge tapering width and at its inner edge a substantially round, to the narrowest point of the step adjoining step head, the width of which is greater than the narrowest point of the step and wherein the spacers are adapted to the step heads as seen in plan.

Spiral stairs of this type are well known (cf. DT-Gbm 72 26 698). You can find recently again more frequent use, especially when renovating old buildings, for example To make certain areas of an old building accessible from one floor to the other without the main staircase to have to use.

In the known spiral stairs there is the problem that the minimum tread width according to the statutory regulations must be 10 cm, so that, for example, a 15-step staircase Minimum circumference in the inner area of 150 cm results. This forces a dead space in the central area of the Spiral staircase, which has a diameter of 48 cm

having. ~ ·. ,

In another known spiral staircase of this type (see. US-PS 34 91 498) the axis of the spindle follows a helix. The dead space otherwise accepted is avoided there, it can be used as Tension cord but only tension cables or tension ropes are used. This makes the installation, in particular, the subsequent installation in already existing parts of the building is made more difficult, as these are continuous Tension cables or ropes must be laid in one piece. The installation of such stairs by laypeople is by no means possible.

The invention is based on the object of creating a spiral staircase which while maintaining the legally required and statically necessary conditions reduce the mean dead space to a minimum reduced and which the use of the known composed of threaded pieces and sleeves Tension cords made possible.

This object on which the invention is based is achieved in that the tension cord is in the step head and is eccentrically arranged in the spacer so that between the tension cord and the end of the supported head area in the direction of the outer peripheral edge of the step plate a the regulations and The area supported by the spacers corresponds to the desired load-bearing capacity is, while on the opposite side next to the tension cord on the stepped head and on the spacer only a relatively small retaining collar is available.

This arrangement creates a spiral staircase, with the spindle on the necessary part is reduced, so that in addition to the tension cord only one absorbs the necessary buckling stress Halie collar remains, whereby the free shoulder area when walking the spiral staircase opposite the according to DT-Gbm 72 26 698 known spiral stairs can be enlarged.

Compared to the spiral staircase according to US-PS 34 91 498, the advantage is achieved that the structure of the Staircase from bottom to top is possible continuously without first drawing in a continuous Tension rope or cable is required. By precisely calculating the stairs and making the Staircase in prefabricated components is compared to the device according to the US-PS and the structure of the Staircase according to the invention possible by a do-it-yourselfer.

According to a further feature of the invention it is provided that the step head and the spacer is a section encompassing the center point X of a circle and the center point X lies in the center of the tension cord. The procedure is preferably such that the outer peripheral edge of the step head and the spacer form an arc of a circle, the center point of which , as seen from the center point X , is shifted towards the step.

According to a preferred embodiment of the invention, the spacers have a smaller outer diameter on than the head pieces.

An embodiment of the invention is explained below with reference to the drawing, it shows

F i g. 1 in an exploded view

the individual components of the staircase,

Fig. 2 in a section some firmly interconnected step plates,

3 shows the schematic top view of the spiral staircase,

F i g. 4 a diagrammatic side view,

F i g. 5 a section of a stair step.

The tension cord 1 consists of individual threaded bolts 2 and 3, which are interposed with each other of abutment washers 7 are connected via sleeves 4. The footplates 5 and the spacers 6 are held together by the tension cord 1.

The actual step plate 5 consists of a step head Jt and the step area 9, the step area 9 tapering inwards from the outer peripheral edge IC, so that it connects at its narrowest point at 11 to the step head 8, which has a greater width than has the narrowest point at 11. From Fig. 5 it can be seen that the tension cord 1 is arranged in the outer circumferential area of the sill head 8, this tension cord forming the center X of a circle 12 which touches the outer areas 13 and 14 of the step head directed towards the outer circumferential edge 10. The step head represents a section of a circle, the arc formed having the center point Y , which is shifted relative to the center point X / .ur the outer peripheral edge 10 of the step 5.

In FIG. 4, the dash-dotted lines A and A ' show the outer circumference of the circle which has the center X and which is normally filled by the central supporting structure of the spiral staircase. The corresponding shaping of the step head 8 creates the free areas between the line A or A ' and the rear edge of the step head, thereby achieving the desired shoulder freedom.

For this purpose 3 sheets of drawings

Claims (4)

Patent claims: 1. Spiral staircase with step plates engaging in the spindle, with spacers for the step plates in the area of the spindle, as well as with one arranged in the axis of the spindle, the footplates and the Spacers penetrating, vertical tension cord, the tread plates each one from the outer peripheral edge tapering width and at its inner edge a substantially round, itself have at the narrowest point of the step adjoining step head, the width of which is greater than that is the narrowest point of the step and where the spacers seen in plan to the Step heads are adapted, characterized in that that the tension cord (1) in the step head (8) and in the spacer (6) is arranged eccentrically, so that between the Tension cord (1) and the end of the supported head area in the direction of the outer peripheral edge (10) the step plate (5) a corresponding to the regulations and the desired load-bearing capacity, by the spacers (6) supported area is present, while on the opposite Side next to the tension cord on the stepped head (8) and on the spacer only a relatively small retaining collar is available. 2. Spiral staircase according to claim 1, characterized in that the step head (8) and the spacer (6) is a center (X) of a circle encompassing section and the center (X) is in the center of the tension cord. 3. Spiral staircase according to claim 2, characterized in that the outer peripheral edge of the step head (8) and the Ahstandsstückes forms an arc, the center point (Y) of the center point (X) is shifted towards the step as seen. 4. spiral staircase according to claim 3, characterized in that the spacers (6) have a have a smaller outer diameter than the head pieces.